*cpu1: uvm_fault(0xfffffd006cf18200, 0x98, 0, 1) -> e ddb{0}> show kasan No such command ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7d5a335f8370, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a79d380 rbx 0 rdx 0 rcx 0xffff800045fe8550 rax 0x3b r8 0xffff80002a79d2b0 r9 0 r10 0x4a4619fca90b2005 r11 0x8907d48143977403 r12 0 r13 0 r14 0xffff800045fe8550 r15 0 rip 0xffffffff82c643ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a79d300 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{0}> show proc PROC (syz-executor) tid=146598 pid=53789 tcnt=2 stat=onproc flags process=0 proc=0 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800045fe8fb0,0xffff800045fe9788 process=0xffff800045fec9b8 user=0xffff80002a798000, vmspace=0xfffffd006fbb5b78 estcpu=36, cpticks=1, pctcpu=0.0, user=1, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND *53789 146598 9067 0 7 0 0 syz-executor 53789 363650 9067 0 2 0 0x4000080 syz-executor 47621 468529 2187 0 2 0 0 syz-executor 47621 99334 2187 0 2 0 0x4000000 syz-executor 31673 466360 54466 0 3 0x1010 0x2000 suspend syz-executor 31673 473949 54466 0 2 0x1010 0x4080000 syz-executor 31327 212083 19188 60928 2 0x10 0 syz-executor 31327 364842 19188 60928 3 0x10 0x4000080 fsleep syz-executor 31327 44168 19188 60928 3 0x10 0x4000080 fsleep syz-executor 22164 152857 64125 0 2 0 0 syz-executor 22164 440905 64125 0 3 0 0x4000080 kqsel syz-executor 22164 384891 64125 0 7 0 0x4000000 syz-executor 22837 67639 74644 0 3 0 0x80 nanoslp syz-executor 22837 81542 74644 0 3 0 0x4000080 fsleep syz-executor 22837 297351 74644 0 3 0 0x4000080 sbwait syz-executor 6191 11748 99796 0 2 0x2 0 syz-executor 54466 30724 99796 0 3 0x2 0x80 nanoslp syz-executor 99827 277525 99796 0 3 0x2 0x80 piperd syz-executor 9067 283176 99796 0 3 0x2 0x80 nanoslp syz-executor 19188 330142 99796 0 3 0x2 0x80 nanoslp syz-executor 64125 117945 99796 0 3 0x2 0x80 nanoslp syz-executor 2187 317414 99796 0 3 0x2 0x80 nanoslp syz-executor 74644 492944 99796 0 3 0x2 0x80 nanoslp syz-executor 99796 215370 67451 0 2 0x2 0 syz-executor 67451 22066 69797 0 3 0x100002 0x88 sigsusp ksh 69797 70889 43698 0 3 0x10 0x88 kqread sshd-session 43698 75931 51218 0 3 0x12 0x80 kqread sshd-session 96004 264824 1 0 3 0x100003 0x80 ttyin getty 51218 423403 1 0 3 0 0x88 kqread sshd 88865 103219 47245 74 3 0x1100012 0x80 bpf pflogd 47245 367302 1 0 3 0 0x80 sbwait pflogd 23715 72575 79118 73 3 0x1100010 0x80 kqread syslogd 79118 143812 1 0 3 0x100002 0x80 sbwait syslogd 71441 99263 1 0 3 0x100000 0x80 kqread resolvd 89465 500065 72079 77 3 0x100012 0x80 kqread dhcpleased 13748 116815 72079 77 3 0x100012 0x80 kqread dhcpleased 72079 220825 1 0 3 0 0x80 kqread dhcpleased 15078 42611 0 0 3 0x14000 0x200 bored smr 59477 397025 0 0 2 0x14000 0x200 zerothread 49618 450815 0 0 3 0x14000 0x200 aiodoned aiodoned 43718 347981 0 0 3 0x14000 0x200 syncer update 99157 407682 0 0 3 0x14000 0x200 cleaner cleaner 832 179835 0 0 3 0x14000 0x200 reaper reaper 3716 491092 0 0 3 0x14000 0x200 pgdaemon pagedaemon 79135 137684 0 0 3 0x14000 0x200 bored viomb 11802 272922 0 0 3 0x14000 0x40000200 acpi0 acpi0 72607 45446 0 0 3 0x14000 0x40000200 idle1 83705 168088 0 0 3 0x14000 0x200 bored softnet1 8311 479082 0 0 3 0x14000 0x200 bored softnet0 22038 252912 0 0 3 0x14000 0x200 bored systqmp 73004 291963 0 0 3 0x14000 0x200 bored systq 97750 173274 0 0 3 0x14000 0x200 tmoslp softclockmp 88024 32190 0 0 3 0x14000 0x40000200 tmoslp softclock 67970 143144 0 0 3 0x14000 0x40000200 idle0 1 384790 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &sched_lock r = 0 (0xffffffff83a657f8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 futex_wake+0x245 futex_list_wakeup sys/kern/sys_futex.c:345 [inline] #2 futex_wake+0x245 sys/kern/sys_futex.c:482 #3 sys_futex+0x1d9 sys/kern/sys_futex.c:158 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #5 Xsyscall+0x128 Process 53789 (syz-executor) thread 0xffff800045fe8550 (146598) exclusive rwlock futexlk r = 0 (0xffffffff839ebf68) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 futex_wake+0xbc sys/kern/sys_futex.c:467 #3 sys_futex+0x1d9 sys/kern/sys_futex.c:158 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #5 Xsyscall+0x128 exclusive mutex &sched_lock r = 0 (0xffffffff83a657f8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 futex_wake+0x245 futex_list_wakeup sys/kern/sys_futex.c:345 [inline] #2 futex_wake+0x245 sys/kern/sys_futex.c:482 #3 sys_futex+0x1d9 sys/kern/sys_futex.c:158 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #5 Xsyscall+0x128 Process 22164 (syz-executor) thread 0xffff800045fe8020 (384891) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a82180) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11067 12091K 12409K 166960K 12227 0 pcb 17 13K 13K 166960K 53 0 rtable 223 7K 7K 166960K 368 0 pf 35 17K 24K 166960K 71 0 ifaddr 40 6K 7K 166960K 47 0 ifgroup 55 2K 2K 166960K 61 0 sysctl 3 1K 9K 166960K 7 0 counters 70 37K 37K 166960K 74 0 ioctlops 0 0K 4K 166960K 1496 0 iov 0 0K 2K 166960K 6 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1300 82K 82K 166960K 1487 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 6 0K 0K 166960K 6 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 16 57K 93K 166960K 257 0 sigio 0 0K 0K 166960K 1 0 proc 72 115K 212K 166960K 568 0 subproc 64 4K 4K 166960K 136 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 13 0 in_multi 88 5K 6K 166960K 102 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 9 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 55 254K 254K 166960K 55 0 exec 0 0K 1K 166960K 401 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 233 155K 160K 166960K 3927 0 UVM aobj 6 2K 2K 166960K 7 0 pinsyscall 41 82K 103K 166960K 1413 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 1 0 NDP 12 0K 2K 166960K 30 0 temp 33 9114K 9130K 166960K 5158 0 kqueue 13 20K 26K 166960K 44 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 28 0 0 1 0 1 1 0 8 0 rtpcb 120 35 0 32 1 0 1 1 0 8 0 rtentry 176 112 0 12 6 0 6 6 0 8 0 unpcb 144 229 0 82 6 0 6 6 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 30 0 25 1 0 1 1 0 8 0 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 165 0 156 5 0 5 5 0 8 3 nd6 152 25 0 3 1 0 1 1 0 8 0 kcovpl 48 15 0 8 1 0 1 1 0 8 0 ppxss 1192 1 0 1 1 0 1 1 0 8 1 pfstscr 40 2 0 2 1 0 1 1 0 8 1 pffrent 40 3 0 3 1 0 1 1 0 8 1 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfsrclim 320 1 0 1 1 0 1 1 0 8 1 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pfstitem 24 29 0 0 1 0 1 1 0 8 0 pfstkey 128 31 0 2 1 0 1 1 0 8 0 pfstate 448 30 0 1 4 0 4 4 0 8 0 pfrule 1360 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 454 0 44 29 0 29 29 0 8 2 art_table 40 455 0 44 5 0 5 5 0 8 0 art_node 32 112 0 21 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semapl 72 4 0 0 1 0 1 1 0 8 0 shmpl 112 4 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1732 0 252 93 0 93 93 0 8 0 ffsino 296 1732 0 252 115 0 115 115 0 8 0 nchpl 144 2068 0 354 64 0 64 64 0 8 0 vnodes 216 1928 0 0 108 0 108 108 0 8 0 namei 1024 6660 0 6660 2 1 1 2 0 8 1 percpumem 16 53 0 2 1 0 1 1 0 8 0 kstatmem 264 33 0 4 2 0 2 2 0 8 0 scxspl 216 7302 0 7302 9 3 6 7 1 8 6 plimitpl 152 50 0 31 1 0 1 1 0 8 0 sigapl 424 558 0 512 7 1 6 7 0 8 0 knotepl 120 396 0 0 12 0 12 12 0 8 0 kqueuepl 224 60 0 50 1 0 1 1 0 8 0 pipepl 344 157 0 130 3 0 3 3 0 8 0 fdescpl 528 542 0 512 3 0 3 3 0 8 0 filepl 160 2572 0 2167 19 1 18 18 0 8 1 lockfpl 104 57 0 54 1 0 1 1 0 8 0 lockfspl 48 22 0 19 1 0 1 1 0 8 0 sessionpl 144 33 0 24 1 0 1 1 0 8 0 pgrppl 48 50 0 33 1 0 1 1 0 8 0 ucredpl 104 227 0 212 1 0 1 1 0 8 0 zombiepl 144 513 0 512 1 0 1 1 0 8 0 processpl 1232 558 0 512 5 0 5 5 0 8 1 procpl 664 724 0 669 5 0 5 5 0 8 0 sockpl 752 431 0 272 17 0 17 17 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 122 0 0 16 0 16 16 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mextrefs 64 16 0 0 1 0 1 1 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 139 0 0 9 0 9 9 0 8 0 bufpl 272 2494 0 105 160 0 160 160 0 8 0 anonpl 32 7542 0 0 62 1 61 62 0 247 0 amapchunkpl 152 11603 0 11039 25 0 25 25 0 158 3 amappl16 200 1748 0 1545 13 2 11 11 0 8 0 amappl15 192 24 0 24 1 1 0 1 0 8 0 amappl14 184 435 0 434 1 0 1 1 0 8 0 amappl13 176 134 0 122 1 0 1 1 0 8 0 amappl12 168 860 0 831 2 0 2 2 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 63 0 49 1 0 1 1 0 8 0 amappl9 144 387 0 387 1 1 0 1 0 8 0 amappl8 136 116 0 114 1 0 1 1 0 8 0 amappl7 128 147 0 134 1 0 1 1 0 8 0 amappl6 120 155 0 154 1 0 1 1 0 8 0 amappl5 112 106 0 95 1 0 1 1 0 8 0 amappl4 104 296 0 271 1 0 1 1 0 8 0 amappl3 96 1990 0 1893 3 0 3 3 0 8 0 amappl2 88 673 0 597 2 0 2 2 0 8 0 amappl1 80 11035 0 10436 15 1 14 15 0 8 1 amappl 88 3167 0 3005 4 0 4 4 0 92 0 uvmvnodes 80 101 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 6 0 1 1 0 1 1 0 8 0 uaddrrnd 24 542 0 512 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 542 0 512 1 0 1 1 0 8 0 vmmpekpl 168 6567 0 6524 3 0 3 3 0 8 0 vmmpepl 168 43963 0 41911 91 0 91 91 0 357 0 vmsppl 488 541 0 512 5 0 5 5 0 8 1 rwobjpl 80 15592 0 14375 25 0 25 25 0 8 0 pdppl 4096 1091 0 1024 99 30 69 85 0 8 2 pvpl 32 14074 0 0 116 2 114 114 0 265 0 pmappl 256 541 0 512 3 0 3 3 0 8 1 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 431 0 35 12 0 12 12 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7d5a335f8370, count: -1 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff80002999dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:670 comcnputc(800,67) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,67) at comcnputc+0x250 sys/dev/ic/com.c:1274 cnputc(67) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(67) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834af9c6) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80002a7b5290) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff80002a7b5290) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80002a7b5290) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff800045fe8020,fffffd0063079cb0,ffff80002a7b5470) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimes(ffff800045fe8020,ffff80002a7b55c0,ffff80002a7b5510) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2733 end trace frame: 0xffff80002a7b55b0, count: 0 ddb{1}> trace x86_ipi_db(ffff80002999dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:670 comcnputc(800,67) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,67) at comcnputc+0x250 sys/dev/ic/com.c:1274 cnputc(67) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(67) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834af9c6) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80002a7b5290) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff80002a7b5290) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80002a7b5290) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff800045fe8020,fffffd0063079cb0,ffff80002a7b5470) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimes(ffff800045fe8020,ffff80002a7b55c0,ffff80002a7b5510) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2733 syscall(ffff80002a7b55c0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a7b55c0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9fb42250f0, count: -16